Sept. 4, 2003 — Fossilized skulls from a long-extinct tribe found in Mexico have reignited a debate about how Homo sapiens colonized the Americas after his emergence from Africa and long trek across Asia.

The conventional view is that Native Americans are the descendants of Mongoloid people who crossed over from Asia to Alaska, in a migration that starting between 40,000 and 12,000 years ago.

These intrepid settlers used the shallow island chain of the Bering Strait — as it then was — as stepping stones.

After they arrived in Alaska, they progressively headed southwards, eventually ending up in the tip of South America.

That theory has come under gentle pressure over the past decade, thanks to a mosaic of archaeological evidence which suggests that the very first Americans may have come from elsewhere.

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